chore: Make conan generate script a script

[mathbunnyru]

High Level Overview of Change

I'm moving instructions to a separate file, and instead of removing packages, set conan home as temporary dir

There are many advantages:

• I'm not messing with the user's conan home, so there is no need to remove packages (it might be not nice, when people use multiple branches, which change dependencies)
• running is just calling one script (and it will be nicely saved in bash history)
• bash code is stored in bash files, markdown in markdown (so tools|editors work better)
• this can be automated if needed

Context of Change

Type of Change

• Bug fix (non-breaking change which fixes an issue)
• New feature (non-breaking change which adds functionality)
• Breaking change (fix or feature that would cause existing functionality to not work as expected)
• Refactor (non-breaking change that only restructures code)
• Performance (increase or change in throughput and/or latency)
• Tests (you added tests for code that already exists, or your new feature included in this PR)
• Documentation update
• Chore (no impact to binary, e.g. .gitignore, formatting, dropping support for older tooling)
• Release

API Impact

• Public API: New feature (new methods and/or new fields)
• Public API: Breaking change (in general, breaking changes should only impact the next api_version)
• libxrpl change (any change that may affect libxrpl or dependents of libxrpl)
• Peer protocol change (must be backward compatible or bump the peer protocol version)

[codecov]

Codecov Report

✅ All modified and coverable lines are covered by tests.
✅ Project coverage is 78.6%. Comparing base (4e25dc9) to head (cf10499).
⚠️ Report is 1 commits behind head on develop.

Additional details and impacted files

@@            Coverage Diff            @@
##           develop   #6085     +/-   ##
=========================================
- Coverage     78.6%   78.6%   -0.0%     
=========================================
  Files          818     818             
  Lines        68938   68938             
  Branches      8231    8241     +10     
=========================================
- Hits         54176   54163     -13     
- Misses       14762   14775     +13     

see 5 files with indirect coverage changes

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